package com.lxk.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.net.InetSocketAddress;

/**
 * @author JohnSoybean
 */
@Component
@Slf4j
public class NettyServer implements Runnable {

    //CFG    @Value("${netty.port}")
    private final static Integer port = 9000;
    /**
     * boss 线程组用于处理连接工作
     */
    private EventLoopGroup boss = new NioEventLoopGroup();
    /**
     * work 线程组用于数据处理
     */
    private EventLoopGroup work = new NioEventLoopGroup();

    /**
     * 启动Netty Server
     *
     */
//    @PostConstruct
    @Override
    public void run() {
        ServerBootstrap bootstrap = new ServerBootstrap();
        bootstrap.group(boss, work)
                // 指定Channel
                .channel(NioServerSocketChannel.class)
                //使用指定的端口设置套接字地址
                .localAddress(new InetSocketAddress(port))
                //服务端可连接队列数,对应TCP/IP协议listen函数中backlog参数
                .option(ChannelOption.SO_BACKLOG, 1024)
                //设置TCP长连接,一般如果两个小时内没有数据的通信时,TCP会自动发送一个活动探测数据报文
                .childOption(ChannelOption.SO_KEEPALIVE, true)
                //将小的数据包包装成更大的帧进行传送，提高网络的负载
                .childOption(ChannelOption.TCP_NODELAY, true)
                .childHandler(new com.lxk.netty.ServerChannelInitializer());
        ChannelFuture future = null;
        try {
            future = bootstrap.bind().sync();
            if (future.isSuccess()) {
                log.info("Netty Server 启动成功");
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    @PreDestroy
    public void destroy() throws InterruptedException {
        boss.shutdownGracefully().sync();
        work.shutdownGracefully().sync();
        log.info("已关闭Netty");
    }
}
